Anti-gravity

Definition and stakes

Randall Garrett,  By Proxy

“ I understand that, at the trial, it was said that you claimed it was an antigravity device, but that you denied it."
"Those idiots!" Porter exploded angrily. "Nobody understood what I was talking about because they wouldn't listen! Antigravity! Pfui! When they learned how to harness electricity, did they call it anti-electricity? When they built the first atomic reactor, did they call it anti-atomic energy? A rocket works against gravity, but they don't call that antigravity, do they? My device works with gravity, not against it."
"What sort of device is it?" Elshawe asked.
”
Source: Gutenberg

Portrait of Donald A. Wollheim Donald A. Wollheim,  The Secret of the Ninth Planet

“ Within the bulk of the top third of the ship was this massive power source, its atomic components, its uranium-hydrogen fuel, and the beam that channeled the gravitational drive.
"Negating gravity is not a simple matter like inventing a magic sheet of metal that cuts off the pull of the Earth, such as H. G. Wells wrote about," Oberfield had explained. "That is impossible because it ignores all the other laws of nature; it forgets the power of inertia, it denies the facts of mass and density. It takes just as much energy to lift an anti-gravity ship as to lift a rocketship.
”
Source: Gutenberg

William Thomson, 1st Baron Kelvin,  Mathematical and physical Papers (1911)

“ Le Sage held that such collisions are extremely rare; that each collision, even between the ultramundane corpuscules themselves, destroys some energy; [9] that at a not infinitely remote past time they were set in motion for the purpose of k',eping gravitation throughout the world in action for a limited period of time; and that both by their mutual collisions, and by collisions with mundane atoms, the whole stock of gravific energy is being gradually reduced, and therefore the intensity of gravity gradually diminishing from age to age. ”
Source: Wikisource

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